diff --git a/src/test/java/com/cloudbees/jenkins/support/CheckFilterTest.java b/src/test/java/com/cloudbees/jenkins/support/CheckFilterTest.java
index bac3b0875..2290aef12 100644
--- a/src/test/java/com/cloudbees/jenkins/support/CheckFilterTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/CheckFilterTest.java
@@ -78,10 +78,7 @@ public class CheckFilterTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/Security2186Test.java b/src/test/java/com/cloudbees/jenkins/support/Security2186Test.java
index e374f35e4..ef56304da 100644
--- a/src/test/java/com/cloudbees/jenkins/support/Security2186Test.java
+++ b/src/test/java/com/cloudbees/jenkins/support/Security2186Test.java
@@ -54,10 +54,7 @@ public void setup() throws Exception {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/SupportActionTest.java b/src/test/java/com/cloudbees/jenkins/support/SupportActionTest.java
index e61e27668..78b7bce91 100644
--- a/src/test/java/com/cloudbees/jenkins/support/SupportActionTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/SupportActionTest.java
@@ -87,10 +87,7 @@ public void setUp() {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/SupportTestUtils.java b/src/test/java/com/cloudbees/jenkins/support/SupportTestUtils.java
index c5393d819..f080b9b2b 100644
--- a/src/test/java/com/cloudbees/jenkins/support/SupportTestUtils.java
+++ b/src/test/java/com/cloudbees/jenkins/support/SupportTestUtils.java
@@ -20,7 +20,10 @@
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.DirectoryStream;
 import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
@@ -48,6 +51,7 @@
  * @since 2.26
  */
 public class SupportTestUtils {
+    private static final Logger LOGGER = Logger.getLogger(SupportTestUtils.class.getName());
 
     /**
      * Invoke a component, and return the component contents as a String.
@@ -337,4 +341,37 @@ public static void testPermissionToDisplayAction(
     public static boolean isJava8OrBelow() {
         return System.getProperty("java.specification.version").startsWith("1.");
     }
+
+    public static void stopAgents() throws Exception {
+        for (var agent : Jenkins.get().getNodes()) {
+            LOGGER.info("stopping " + agent);
+            agent.toComputer().disconnect(null).get();
+        }
+        var dir = Jenkins.get().getRootDir().toPath().resolve("agent-work-dirs");
+        for (int i = 0; i < 60; i++) {
+            try {
+                delete(dir);
+                LOGGER.info("successfully deleted " + dir);
+                return;
+            } catch (IOException x) {
+                LOGGER.log(Level.WARNING, "failed to delete " + dir + " on attempt #" + i, x);
+                Thread.sleep(1000);
+            }
+        }
+        LOGGER.warning("never managed to delete " + dir);
+    }
+
+    private static void delete(Path p) throws IOException {
+        LOGGER.info(() -> "deleting " + p);
+        if (Files.isDirectory(p, LinkOption.NOFOLLOW_LINKS)) {
+            try (DirectoryStream<Path> children = Files.newDirectoryStream(p)) {
+                for (Path child : children) {
+                    delete(child);
+                }
+            }
+        }
+        Files.deleteIfExists(p);
+    }
+
+    private SupportTestUtils() {}
 }
diff --git a/src/test/java/com/cloudbees/jenkins/support/actions/SupportComputerActionTest.java b/src/test/java/com/cloudbees/jenkins/support/actions/SupportComputerActionTest.java
index 6743156c5..832bd94d0 100644
--- a/src/test/java/com/cloudbees/jenkins/support/actions/SupportComputerActionTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/actions/SupportComputerActionTest.java
@@ -29,10 +29,7 @@ public class SupportComputerActionTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/configfiles/AgentsConfigFileTest.java b/src/test/java/com/cloudbees/jenkins/support/configfiles/AgentsConfigFileTest.java
index 09b136764..c913dcc8e 100644
--- a/src/test/java/com/cloudbees/jenkins/support/configfiles/AgentsConfigFileTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/configfiles/AgentsConfigFileTest.java
@@ -48,10 +48,7 @@ public class AgentsConfigFileTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/filter/SensitiveContentFilterTest.java b/src/test/java/com/cloudbees/jenkins/support/filter/SensitiveContentFilterTest.java
index 73b29c77e..987a727aa 100644
--- a/src/test/java/com/cloudbees/jenkins/support/filter/SensitiveContentFilterTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/filter/SensitiveContentFilterTest.java
@@ -25,6 +25,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import com.cloudbees.jenkins.support.SupportTestUtils;
 import hudson.model.FreeStyleProject;
 import hudson.model.ListView;
 import hudson.model.User;
@@ -42,10 +43,7 @@ public class SensitiveContentFilterTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Issue("JENKINS-21670")
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/AboutJenkinsTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/AboutJenkinsTest.java
index 48b4eb6c5..265198f0f 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/AboutJenkinsTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/AboutJenkinsTest.java
@@ -34,10 +34,7 @@ public class AboutJenkinsTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/DumpExportTableTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/DumpExportTableTest.java
index 51f5c8f48..c4639ef2e 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/DumpExportTableTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/DumpExportTableTest.java
@@ -26,10 +26,7 @@ public class DumpExportTableTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/FileDescriptorLimitTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/FileDescriptorLimitTest.java
index 7f224f877..8d33e60c3 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/FileDescriptorLimitTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/FileDescriptorLimitTest.java
@@ -47,10 +47,7 @@ public class FileDescriptorLimitTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/NodeExecutorsTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/NodeExecutorsTest.java
index 5e5c4561a..304314c40 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/NodeExecutorsTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/NodeExecutorsTest.java
@@ -41,10 +41,7 @@ public class NodeExecutorsTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/NodeRemoteDirectoryComponentTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/NodeRemoteDirectoryComponentTest.java
index 6f5c0e92c..471e2f655 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/NodeRemoteDirectoryComponentTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/NodeRemoteDirectoryComponentTest.java
@@ -22,10 +22,7 @@ public class NodeRemoteDirectoryComponentTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     /*
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveCommandStatisticsTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveCommandStatisticsTest.java
index a329272f3..72388714b 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveCommandStatisticsTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveCommandStatisticsTest.java
@@ -60,10 +60,7 @@ public class SlaveCommandStatisticsTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsRestartTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsRestartTest.java
index aacdf4feb..97a7913e5 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsRestartTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsRestartTest.java
@@ -59,10 +59,7 @@ public void twoAgents() throws Throwable {
                     allOf(
                             containsString("Z agent1] Remoting version: "),
                             containsString("Z agent2] Remoting version: ")));
-            for (var agent : r.jenkins.getNodes()) {
-                System.err.println("Stopping " + agent);
-                agent.toComputer().disconnect(null).get();
-            }
+            SupportTestUtils.stopAgents();
         });
     }
 }
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsTest.java
index bbf085cff..38aa0c672 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/SlaveLaunchLogsTest.java
@@ -46,10 +46,7 @@ public class SlaveLaunchLogsTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test
diff --git a/src/test/java/com/cloudbees/jenkins/support/impl/SmartLogCleanerTest.java b/src/test/java/com/cloudbees/jenkins/support/impl/SmartLogCleanerTest.java
index 29f118844..66a4d0a4d 100644
--- a/src/test/java/com/cloudbees/jenkins/support/impl/SmartLogCleanerTest.java
+++ b/src/test/java/com/cloudbees/jenkins/support/impl/SmartLogCleanerTest.java
@@ -4,6 +4,7 @@
 import static org.junit.Assert.assertNotNull;
 
 import com.cloudbees.jenkins.support.SupportPlugin;
+import com.cloudbees.jenkins.support.SupportTestUtils;
 import com.cloudbees.jenkins.support.api.Component;
 import com.cloudbees.jenkins.support.filter.ContentFilters;
 import hudson.ExtensionList;
@@ -31,10 +32,7 @@ public class SmartLogCleanerTest {
 
     @After
     public void stopAgents() throws Exception {
-        for (var agent : j.jenkins.getNodes()) {
-            System.err.println("Stopping " + agent);
-            agent.toComputer().disconnect(null).get();
-        }
+        SupportTestUtils.stopAgents();
     }
 
     @Test